Hello. I replaced my mi3 motherboard with a motherboard bought from AliExpress as the antenna was damaged in my original motherboard. Seems like it's the China unicom version motherboard. It's mi3w snapdragon version. It works well with 2g in Sri Lanka. But unfortunately it doesn't register in any of the 3g networks. (sim card works fine). The 3g band also matches to Sri Lankas version. When I manually search for 3g networks it shows 3g networks. But fail to register. Can you please help me with this to fix this issue. Thank you.